Machine for straightening and gaging twistidrills



(NoModaL) v T. HOOKER,

Machine for Straightening aiild Gaging Twist Drills w and Bits.

- Nb. 235,533. Patented Dec. 14,1880.

' same against outward pressure.

' came STATES:

PATENT @rrroia.

THOMAS HOOKER, or SYRACUSE, NEW YORK.

MACHINE FOR STRAIGHTENING AND GAGING TWISTiDRILLS iAND BITS.

SPECIFICATION forming part of Letters Patent No. 235,533, dated December 14, 1880.

Application filed April 23, 1880.

To all whom it may concern:

Be it known that I, THOMAS HOOKER, of

Syracuse, in the county of Onondaga, in the State of New York, have invented new and useful Improvements in Machines for Straight- .en ing and Gaging Twist Drills and Bits, of

which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

The purpose of this invention is to straighten and gage drills, bits, and other; analogous tools with dispatch, facility, and accuracy.

The invention is clearly illustrated in the accompanying drawings, wherein Figures 1 and 3, are end views, showing the adaptation of my machine for operating on drills, &c., of different styles and sizes. Fig. 2 is'axplan view of same.

ried between the rollers. Fig. 5 is a longitudinal section of the device used for straightening the head of the toolfand Fig. 6 shows a front and side view of the support of the former detached.

Similar letters of reference indicate corresponding parts.

A A are two rigid upright iron frames arranged parallel to each other. Each of said frames is provided with a horizontal way, a, in which are placed, respectively,two journalboxes, I) b.

O G represent two rollers arranged between the frames A A,and journaled at opposite ends in the boxes I), aforesaid. The roller 0 is Set in its proper position in relation to the stop 1), according to the size of the drill-blank to be operated on, bygmeans of a set screw, 0, inserted horizontally through one end of each of the frames A, and bearing against'the side of the box of the roller 0, thus sustaining the The boxes I) of the other roller, 0, are provided, respectively, with an internally screwthreaded sleeve, d, in which works a screw, 6, extended horizontally through the adjacent end of the frame A, and provided at the outside thereof with a miter-gear, f. By means of a shoulder, s, at the outer end of the threaded portion of the screw 0, bearing against a corresponding shoulder within the frame A,

; and the hub of the gear f abutting against Fig. 4 is a detached view of. one of the devices by which the tool is car- (No model.)

the exterior of said frame, the screw 6 is prevented from moving longitudinally.

In front of the gear f is a horizontal shaft, h, extended across the machine and provided with miter-gears i t, which mesh in the two gears ff, respectively. By means of a crank, K, on the end of the shaft h the latter can be rotated, and thus by its gears i 6 caused to turn the gears f f on the set-screws e. The two sets of gears, being proportioned alike, cause the said set-screws to work in unison and carry the roller 0 perfectly parallel toward and from the roller 0. The roller 0, having its axial bearing adjustable on the ways a, may be set obliquely in relation to the axis of its companion roller, so as to adapt the machine foropcrating on tapered drill-blanks.

The rollers (l C have on one end filoose colively, which latter are designed to bearfon the shank or usually reduced end of the drillblank to be straightened, and therefore require independent rotary motion.

To the opposite end of the respective rollers O O is attached a gear, Z, and directly under said gear and meshing in same is an auxiliary gear, m, which receives motion from a gear, a, on a shaft, 0, arranged relatively midway between the two gears m m. The object of the described arrangement of the intermediate gears m m is to allow the rollers to be moved toward and from each other without throwing the] gears 1 out of connection with the gears m.

I am aware that in other machines the gears of the rollers receive motion direct from the gear of the driving-shaft; but such an arrangement causes the gears of the rollers to become disengaged from the driving-gear by the shiftin g of the rollers, as required in the operation of my machine; hence I do not claim the lastdescribed arrangement of the gears.

19 is a bed or stop designed to support the drill during the process of straightening, said stop consisting of a bar extended across the machine between the two rollers, and adjustably supported by set-Screws r, so as to bring the axis of the drill-blank, when placed upon said stop, slightly below a direct line extended from the axis of one roller to that of the other roller, thereby causing the rollers O C to press the drill-blank downward, and thus dispensing with the extra stop heretofore employed upon the top of the drill-blank, and also allowing the drill-blank to be introduced between the rollers from the top of the machine after retracting the roller 0.

A set-screw, 1", inserted horizontally through the end of the frames A, and engaging the end of the stop p, securely clamps the same in its position. This stop is employed chiefly in straightening brace-bits and other similar tools with a head, and in this operation the roller 0 is set in its required position and clamped by a set-screw, g, inserted through the top of the frame A and bearing on top of the box I).

The roller 0 is moved back by means of the crank K, in the manner before described, to allow the drill orbit to be placed on the stop p. After the introduction of same the roller C is moved up and brought to bear on the tool with the requisite pressure to cause it to be revol vcd by the friction ofthe two rollers,and during said motion to become straightened and brought to a proper gage, a suitable stop being placed between the boxes to limit the approach of the rollers. As soon as the straightening is completed the roller 0 is retracted sufiiciently to allow the tool to be removed from the stop 19.

On one end of the machine is a standard, 1, made trough-shaped on top, for the purpose of supporting a round bar, 11, of steel, which has in its end a tapered cavity, 1, for the reception of the head of the tool lying on the stop 17. For straighteningdrills that are round their whole length, I remove the stop p and fasten both rollers in their requisite position by their top set-screws, g, and hold the tool between the rollers by means of a bar, w, provided with a longitudinal slot adapted to con tain the tool designed to be straightened,and to pass the same between the two rollers,said bar being moved by a lever, r, pivoted on top of the frame A, as illustrated in Fig. 3 of the drawings, or by other suitable means.

Having thus described my invention, what I claim isl. The combination of the rollers 0 C with the collars I) I), mounted loosely thereon, substantially as and for the purpose specified.

2. The combination and arrangement, with the rollers U 0, arranged movably on ways a. and provided,respectively, with gear I and the main driving-gear n, of the intermediate gears, m m. arranged directly under the gears l I, respectively, substantially in the manner described and shown, for the purpose specified.

3. In combination with the where) O, the slotted bar w, substantially in the manner and for the purpose specified.

In testimony whereof I have hereunto signed my name and aflixed my seal in the presence of two attesting witnesses, at Syracuse, in the county of Onondaga and State of New York, this 21st day of April, 1880.

THOMAS HOOKER. a. 8.]

Witnesses E. LAASS, WM. 0. RAYMOND. 

